A one-month baby breastfeeding, three days without poop, may be a normal physiological phenomenon, may also be caused by indigestion and other reasons, can be improved through general treatment, medication, abdominal massage and other ways to improve the symptoms. 1. Normal phenomenon: one-month-old babies three days without defecation, most of them are the performance of saving the stomach, belong to a normal physiological phenomenon. If the baby does not appear other adverse reactions, the general situation is good, can not intervene in the treatment, pay attention to observation can be, usually or with the increase in age, the function of the digestive system will be further improved. 2. indigestion: when the baby has indigestion, may also appear 3 days without stool, parents can give the baby more water, adjust the feeding mode, choose a small number of times, regular feeding, etc., but also to the baby’s abdominal massage, to promote intestinal peristalsis and digestion. Can also follow the doctor’s advice to take probiotic drugs, such as bifidobacteria triple live bacteria, etc. for treatment. Parents are advised to pay attention to the changes of their babies and seek medical advice if there is any abnormality.